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Depth-resolved grazing-incidence time-of-flight neutron scattering from a solid-liquid interface
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2014 (English)In: Journal of applied crystallography, ISSN 0021-8898, E-ISSN 1600-5767, Vol. 47, p. 130-135Article in journal (Refereed) Published
Abstract [en]

Small-angle scattering in grazing-incidence beam geometry has been applied on a time-of-flight neutron instrument to investigate a solid-liquid boundary. Owing to the broad wavelength distribution provided for a specific incident beam angle, the penetration depth of the neutron beam is varied over a wide range in a single measurement. The near surface structures of block copolymer micelles close to silicon substrates with distinct surface energies are resolved. It is observed that the very near surface structure strongly depends on the surface coating, whereas further away from the surface, bulk-like ordering is found.

Place, publisher, year, edition, pages
2014. Vol. 47, p. 130-135
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-219976DOI: 10.1107/S1600576713028665ISI: 000330485100018OAI: oai:DiVA.org:uu-219976DiVA, id: diva2:704515
Available from: 2014-03-12 Created: 2014-03-09 Last updated: 2018-04-11Bibliographically approved
In thesis
1. Opportunities and challenges of surface scattering at next generation neutron sources
Open this publication in new window or tab >>Opportunities and challenges of surface scattering at next generation neutron sources
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Complex fluids and soft matter are ubiquitously found in the world and all contacts in life are made over surfaces. To describe the mechanical behavior of such substances, rheological methods are used. Flow instabilities are a big challenge in rheology since they will be reflected in the macroscopic variables probed, like e. g. the viscosity. Many such discontinuities may actually originate at the surface. Investigating the properties of liquids in contact with the surface under mechanical load is the main course of the thesis. Neutron reflectometry and GISANS are perfect tools in this context to access the solid liquid interfaces, since they can penetrate many engineering materials and show a comparably large scattering potential at deuterated samples. In this thesis shear was applied on a model solution and neutron scattering techniques were used to investigate the structure under load. The focus was set on the development of the measurement methods themselves to enable new scientific insights in the future. First, by stroboscopic measurements the flux limitations are overcome for oscillatory rheology. By reintegration in the post processing it is shown that kinetic measurements with neutrons are possible with a time resolution below one millisecond. Second, the transformation of grazing incidence data from the laboratory system into q-space is strongly non-linear resulting in a need for re-binning. In this thesis a universal tool has been developed for this purpose. Finally, there is an ongoing discussion on depth sensitive neutron scattering experiments from solid-liquid boundaries. By using emission densities we show that such experiments face severe limitations due to the low absorption cross section of the neutron.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 51
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1666
Keyword
GISANS, data reduction, off-specular, neutron scattering, reflectometry, complex fluids, rheology
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-348348 (URN)978-91-513-0324-6 (ISBN)
Public defence
2018-05-25, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30 (English)
Opponent
Available from: 2018-05-08 Created: 2018-04-11 Last updated: 2018-05-08

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Wolff, MaxAdlmann, FranzDennison, Andrew J. C.

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